Jeff Green will have surgery to repair his aorta and will miss the season.
The 25-year-old is expected to make a full recovery.
The medical issue arose when Green was taking a physical last week. He said the problem was found when he took a stress test.
Since then, he has seen a number of specialists, the last of which was in Cleveland at the Cleveland Clinic yesterday.
Because Green could not pass the physical, the free agent contract he signed with the Celtics will be voided.

The comments on Facebook are sickening. People talking shit about Jeff for this are disgusting. Sure we all love basketball and the Celtics, but the players are people, first and foremost. Really sad that so many people don't understand that. Sending healthy thoughts his way.

Jeff,Talking crap about Jeff is ignorant and pathetic. The Celtics did the right thing on getting multiple opinions from the best specialist. This will save this young mans life. We pray that all goes well and you have a speedy recovery.

Apparently aortic aneurysms are not necessarily congenital, so this might be sth that has recently formed as a result of injury or some other cause. Since no further details will be enclosed, we will not know for sure, but aneurysms are not the easiest to detect.

I had a friend go through the same thing, he had the key hole surgery and was back on the court pretty soon after, Jeff may make it back sooner than we think! I hope this is the case not for the Celtics success but it would be a sign of his health returning. All the best Jeff, our thoughts are with you mate